Predictive Modeling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 3, April 1 to June 30, 1993

Download or read book Predictive Modeling of Particle-laden, Turbulent Flows. Quarterly Progress Report No. 3, April 1 to June 30, 1993 written by and published by . This book was released on 1993 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: An Eulerian two-fluid mathematical model is considered for the flow prediction of gas-particle systems. The model expands on the Sinclair and Jackson model by recognizing a turbulent continuous phase. Both the gas- and the particle-phase velocity fields are composed of by a mean and a fluctuating component, and the important physical phenomena arising from the interaction of these components are included in the model. The gas turbulence is modeled by a single-phase closure, namely the k-{var_epsilon} low Reynolds model by Myong and Kasagi, modified to account for the presence of a dilute particle phase. The solid phase is considered as a rapid granular flow; hence, a closure based on the kinetic-theory analogy is used for the description of the stresses associated with this phase. Along with the relation between the fluxes of both phases and the pressure drop, the model is capable of predicting features related to the local flow structure, such as the mean and fluctuating velocity components and the concentration of both phases. In this report, the model is applied to the case of steady, fully developed flow in a vertical cylindrical pipe. An extensive comparison of the model predictions with experimental data is included. The sensitivity of the model predictions to the properties describing the particle collisions is also explored.